JP4301845B2 - Hemp blended sheet - Google Patents
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- JP4301845B2 JP4301845B2 JP2003091637A JP2003091637A JP4301845B2 JP 4301845 B2 JP4301845 B2 JP 4301845B2 JP 2003091637 A JP2003091637 A JP 2003091637A JP 2003091637 A JP2003091637 A JP 2003091637A JP 4301845 B2 JP4301845 B2 JP 4301845B2
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Description
【０００１】
【発明の属する技術分野】
本発明は２以上の繊維シートを抄き合わせてなるシートに関し、特に少なくとも一定量の麻繊維を含有するシートと熱可塑性繊維からなるシートを抄き合わせてなり、環境・人体に優しく、剛性の高いシート、例えば自動車内装材等に適した麻混抄シートに関する。
【０００２】
【従来の技術】
熱可塑性樹脂の用途の一つとして、従来から自動車の内装材としての用途が知られている。この場合には、（１）剛性が高いこと、（２）軽量であること、に加えて（３）線膨張係数が低いことが要求される。線膨張係数の低減は、自動車内温度が季節によって大きく変動し、その温度差が１００℃にも及ぶことに起因するが、熱可塑性樹脂だけでその要求を満たすことは出来ない。
そこで、従来から、熱可塑性樹脂製内装材の線膨張係数を低減させる為の技術が種々提案されており、その代表的な技術として、ガラス繊維からなるマットを熱可塑製樹脂からなる層の表面に貼付して積層体とすることが知られている。
【０００３】
しかしながら近年、ガラス繊維は塵肺病における石綿と似た原因物質となることが判明し、製造作業環境や廃棄処理の困難性の観点から、規制対象となりつつあるので、その代替品の開発が望まれるに至った。これに対し、熱可塑製樹脂と５０〜９０重量％の麻繊維とからなる麻繊維含有熱可塑製樹脂シート層と、熱可塑製樹脂からなる層を夫々１層以上有してなる積層体が提案された（特許文献１及び２）。
【０００４】
【特許文献１】
特開２００１−１２１６５１号公報
【特許文献２】
特開２００１−１２２０４６号公報
【０００５】
【発明が解決しようとする課題】
しかしながら、上記の積層シートは、別々に予め製造した麻繊維含有熱可塑性樹脂シートと熱可塑性樹脂からなるシートを、後から貼り合わせるものであるので、製造工程が煩雑である上高コストとなる。また接着剤によって貼り合わせたものは、溶剤を使用するので製造時に作業環境が悪化するという欠点があった。また、剛性が高い麻繊維をシート中に含むと、シートを曲げた場合に、麻繊維の一部がシートから飛び出して毛羽立ちを生じたり、時には脱落するという欠点があった。
そこで、本発明者は上記の欠点を解決するために鋭意検討した結果、熱可塑性樹脂を全て繊維化し、抄き合わせの技術によって麻繊維と共に積層シートを製造した場合には、安価であるのみならず、環境・人体に優しく、剛性の高いシート、例えば自動車内装材として好適なシートを得ることが出来ることを見出し、本発明に到達した。
従って本発明の第１の目的は、安価で環境・人体に優しく、剛性が高いと共に、麻繊維の脱落が防止された麻混抄シートを提供することにある。
【０００６】
【課題を解決する手段】
本発明の上記の諸目的は、麻繊維を３０〜９０質量％及び熱可塑性樹脂繊維を１０〜７０質量％含有する麻繊維シートの両面に、熱可塑性樹脂繊維を８０質量％以上含有する樹脂繊維シートを、少なくとも１層ずつ抄き合わせてなることを特徴とする麻混抄シートによって達成された。
前記麻繊維シートに含有させる熱可塑性樹脂繊維は、融点が８０〜１８０℃の熱溶融性樹脂繊維であることが好ましく、樹脂繊維シートに含有される熱可塑性樹脂繊維は、融点が８０〜１８０℃の熱溶融性樹脂繊維３０〜６０質量％と融点が２００℃以上の熱可塑性樹脂繊維４０〜７０質量％から成ることが好ましい。また、本発明で使用する麻繊維は、ヤング率が２，５００ｋｇ/ｍｍ２以上のものであることが好ましい。
【０００７】
【発明の実施の形態】
本発明で使用する麻繊維は、リネン（亜麻）、ラミー（苧麻）、ジュート（黄麻）、マニラ麻、サイザル麻、ケナフ（洋麻）等の公知の麻繊維の中から適宜選択することが出来るが、そのヤング率が２，５００ｋｇ/ｍｍ2以上のものが好ましい。このような高ヤング率のものを使用することにより、剛性が高く、例えば自動車内装材として好適な麻混抄シートを得ることが出来る。
本発明の麻混抄シートは抄き合わせによって製造するので、麻繊維等の繊維長は、３〜１００ｍｍであり、特に１０〜６０ｍｍであることが好ましい。また、繊維径は１０〜５００μｍ、好ましくは１００〜３００μｍである。
【０００８】
本発明における、麻繊維を３０〜９０質量％含有するシートに含有される他の繊維は主として熱可塑性樹脂繊維であるが、抄き合わせの後の加熱によって各層を熱融着させるのに支障を生じない限り、適宜他の繊維を併用しても良い。上記熱可塑性樹脂繊維の含有量は、７０〜１０質量％であることが好ましい。ここで使用する熱可塑性樹脂繊維は融点が８０〜１８０℃であるいわゆる熱溶融性樹脂繊維が好ましく、特に１００〜１６０℃であるものが好ましい。このような熱可塑性樹脂繊維の例としては、例えばポリエチレン樹脂繊維、ポリプロピレン樹脂繊維、ポリエステル樹脂繊維等を挙げることが出来る。
【０００９】
本発明における熱可塑性樹脂繊維を含む樹脂繊維シートとは、熱可塑性樹脂繊維が８０質量％以上のシートである。この場合の熱可塑性樹脂繊維としては、前記麻繊維を含有するシートで使用する融点が８０〜１８０℃の熱溶融性樹脂繊維及び融点が２００℃以上の熱可塑性樹脂繊維を併用したものであることが好ましい。これらの熱可塑性樹脂繊維を併用することにより、抄紙工程中の加熱により、融点が８０〜１８０℃の熱溶融性樹脂繊維が溶融し、樹脂繊維シート中の融点が２００℃以上の熱可塑性樹脂繊維同士、又は樹脂繊維シートと麻繊維シートとを接着させ、麻繊維シートの表面を樹脂繊維シートで覆うことが出きるので、麻繊維シート中の麻繊維の毛羽立ちや脱落をより確実に防止することができる。融点が８０〜１８０℃の熱溶融性樹脂繊維の含有量は、３０〜６０質量％、融点が２００℃以上の熱可塑性樹脂繊維の含有量は、４０〜７０質量％であることが好ましい。また、このシートで使用する熱可塑性樹脂繊維以外の繊維は、公知の繊維の中から適宜選択して使用することが出来る。
本発明における樹脂繊維シートは、麻繊維シートと抄き合わすことにより、麻混抄シート中に含有される麻繊維の毛羽立ちや脱落を防止することが出来る。
樹脂繊維シートを麻繊維シートの両面に抄き合わせることが必要である。
【００１０】
本発明の麻混抄シートは、公知の多層抄用抄紙機で製造できる。例えば、円網２基と短網１基を備えた多層抄用抄紙機が挙げられる。
この抄紙機を使用する場合、熱可塑性樹脂繊維を水に分散しスラリーを作製し紙料とする。この紙料を円網で抄紙し、樹脂繊維シートを形成する。一方、麻繊維と熱可塑性樹脂繊維を水に分散しスラリーを作製し紙料とする。この紙料を短網で抄紙し、麻繊維シートを形成する。同時に、毛布に樹脂繊維シート、麻繊維シート、樹脂繊維シートの順に連続して積層し、乾燥することで本発明の麻混抄シートを得ることが出来る。
【００１１】
【発明の効果】
本発明においては、抄き合わせによって連続して積層シートを製造するので生産効率が良く、これによってシートの生産コストを低減させることが出来る他、環境・人体に有害な接着剤等を使用しなくても良い。また、麻繊維の毛羽立ちや脱落が防止される。
【００１２】
【実施例】
以下、本発明を実施例によって更に詳述するが、本発明はこれによって限定されるものではない。
【００１３】
実施例１．
熱可塑性樹脂繊維としてポリエステル繊維（クラレ エステルＥＰ−１３３：融点２６３℃）５０質量部及び熱溶融性ポリエステル繊維（クラレ ソフィットＮ−７２０：融点１１０℃）５０質量部を混合し、水に分散させ０．３質量％のスラリーを作製し、紙料とした。この紙料を角形シートマシンにてシート化し、製紙用フェルトにこのシートを転移させ、第１の樹脂繊維シート（乾燥後の米坪量が約１０ｇ/ｍ２）を形成した。
【００１４】
サイザル麻（繊維長２０ｍｍ、繊維径１８２μｍ、ヤング率：５５００ｋｇ/ｍｍ2）６０質量部と熱溶融性ポリエステル繊維（ユニチカ メルティ４０００：融点１１０℃）４０質量部を混合し、水に分散させて０．３質量％のスラリーを作製し、紙料とした。この紙料を角形シートマシンにてシート化して麻繊維シート（乾燥後の米坪量が約１００ｇ/ｍ２）を形成し、先に製紙用フェルトに転移させた第１の樹脂繊維シート上に転移させ、２つの層からなる抄き合わせシートを得た。
【００１５】
熱可塑性樹脂繊維としてポリエステル繊維（クラレ エステルＥＰ−１３３：融点２６３℃）５０質量部および熱溶融性ポリエステル繊維（クラレ ソフィットＮ−７２０：融点１１０℃）５０質量部を混合し、水に分散させて０．３％のスラリーを作製し、紙料とした。この紙料を角形シートマシンにてシート化して第２の樹脂繊維シート（乾燥後の米坪量が約１０ｇ/ｍ２）を形成し、先に製紙用フェルトに転移させた前記抄き合わせシートの麻繊維シート上に転移させ、３層からなる抄き合わせシートを得た。
この３層からなる抄き合わせシートを１２０℃に加熱したシリンダードライヤーにて乾燥し、米坪１２９．２ｇ/ｍ2で厚さ５６５μｍのシートを得た。
【００１６】
実施例２．
熱可塑性樹脂繊維としてポリエステル繊維（クラレ エステルＥＰ−１３３：融点２６３℃）５０質量部及び熱溶融性ポリエステル繊維（クラレ ソフィットＮ−７２０：融点１１０℃）５０質量部を混合し、水に分散させて０．３質量％のスラリーを作製し、紙料とした。この紙料を角形シートマシンにてシート化し、製紙用フェルトにこのシートを転移させ、第１の樹脂繊維シート（乾燥後の米坪量が約１０ｇ/ｍ２）を形成した。
【００１７】
亜麻（繊維長２０ｍｍ、繊維径３０μｍ、ヤング率：２５００ｋｇ/ｍｍ2）６０質量部と熱溶融性ポリエステル繊維（ユニチカ メルティ４０００：融点１１０℃）４０質量部を混合し、水に分散させて０．３質量％のスラリーを作製し、紙料とした。この紙料を角形シートマシンにてシート化して麻繊維シート（乾燥後の米坪量が約１００ｇ/ｍ２）を形成し、先に製紙用フェルトに転移させた第１の樹脂繊維シート上に転移させ、２つの層からなる抄き合わせシートを得た。
【００１８】
熱可塑性樹脂繊維としてポリエステル繊維（クラレ エステルＥＰ−１３３：融点２６３℃）５０質量部及び熱溶融性ポリエステル繊維（クラレ ソフィットＮ−７２０：融点１１０℃）５０質量部を混合し、水に分散させて０．３質量％のスラリーを作製し、紙料とした。この紙料を角形シートマシンにてシート化して第２の樹脂繊維シート（乾燥後の米坪量が約１０ｇ/ｍ２）を形成し、先に製紙用フェルトに転移させた前記抄き合わせシートの麻繊維シート上に転移させ、３層からなる抄き合わせシートを得た。
この３層からなる抄き合わせシートを１２０℃に加熱したシリンダードライヤーにて乾燥し、米坪１２７．４ｇ/ｍ2で厚さ４３４μｍのシートを得た。
【００１９】
比較例１．
熱可塑性樹脂繊維としてポリエステル繊維（クラレ エステルＥＰ−１３３：融点２６３℃）５０質量部及び熱溶融性ポリエステル繊維（クラレ ソフィットＮ−７２０：融点１１０℃）５０質量部を混合し、水に分散させて０．３質量％のスラリーを作製し、紙料とした。この紙料を角形シートマシンにてシート化し、製紙用フェルトにこのシートを転移させ、第１の樹脂繊維シート（乾燥後の米坪量が約１０ｇ/ｍ２）を形成した。
【００２０】
綿（繊維長２０ｍｍ、繊維径１０μｍ、ヤング率：１，２００ｋｇ/ｍｍ2）３０質量部及び熱溶融性ポリエステル繊維（ユニチカ メルティ４０００：融点１１０℃）７０質量部を混合し、水に分散させて０．３質量％のスラリーを作製し、紙料とした。この紙料を角形シートマシンにてシート化して繊維シート（乾燥後の米坪量が約１００ｇ/ｍ２）を形成し、先に製紙用フェルトに転移させた第１の樹脂繊維シート上に転移させ、２つの層からなる抄き合わせシートを得た。
【００２１】
熱可塑性樹脂繊維としてポリエステル繊維（クラレ エステルＥＰ−１３３：融点２６３℃）５０質量部及び熱溶融性ポリエステル繊維（クラレ ソフィットＮ−７２０：融点１１０℃）５０質量部を混合し、水に分散させて０．３質量％のスラリーを作製し、紙料とした。この紙料を角形シートマシンにてシート化して第２の樹脂繊維シート（乾燥後の米坪量が約１０ｇ/ｍ２）を形成し、先に製紙用フェルトに転移させた前記抄き合わせシートの繊維シート上に転移させ、３層からなる抄き合わせシートを得た。
この３層からなる抄き合わせシートを１２０℃に加熱したシリンダードライヤーにて乾燥し、米坪１２４．４ｇ/ｍ2で厚さ３１７μｍのシートを得た。
【００２２】
比較例２．
熱可塑性樹脂繊維としてポリエステル繊維（クラレ エステルＥＰ−１３３：融点２６３℃）５０質量部及び熱溶融性ポリエステル繊維（クラレ ソフィットＮ−７２０：融点１１０℃）５０質量部を混合し、水に分散させて０．３質量％のスラリーを作製し、紙料とした。この紙料を角形シートマシンにてシート化し、製紙用フェルトにこのシートを転移させ、第１の樹脂繊維シート（乾燥後の米坪量が約１０ｇ/ｍ2）を形成した。
【００２３】
亜麻（繊維長２０ｍｍ、繊維径３０μｍ、ヤング率：２，５００ｋｇ/ｍｍ2）２０質量部と熱溶融性ポリエステル繊維（ユニチカ メルティ４０００：融点１１０℃）８０質量部を混合し、水に分散させて０．３質量％のスラリーを作製し、紙料とした。この紙料を角形シートマシンにてシート化して麻繊維シート（乾燥後の米坪量が約１００ｇ/ｍ２）を形成し、先に製紙用フェルトに転移させた第１の樹脂繊維シート上に転移させ、２つの層からなる抄き合わせシートを得た。
【００２４】
熱可塑性樹脂繊維としてポリエステル繊維（クラレ エステルＥＰ−１３３：融点２６３℃）５０質量部及び熱溶融性ポリエステル繊維（クラレ ソフィットＮ−７２０：融点１１０℃）５０質量部を混合し、水に分散させて０．３質量％のスラリーを作製し、紙料とした。この紙料を角形シートマシンにてシート化して第３層（乾燥後の米坪量が約１０ｇ/ｍ２）を形成し、先に製紙用フェルトに転移させた前記抄き合わせシートの麻繊維シート上に転移させ、３層からなる抄き合わせシートを得た。
この３層からなる抄き合わせシートを１２０℃に加熱したシリンダードライヤーにて乾燥し、米坪１２５．８ｇ/ｍ2で厚さ２８０μｍのシートを得た。
【００２５】
比較例３．
サイザイル麻（繊維長２０ｍｍ、繊維径１８２μｍ、ヤング率５，５００ｋｇ/ｍｍ2）６０質量部と熱溶融性ポリエステル繊維（クラレ ユニチカ メルティ４０００：融点１１０℃）４０質量部を混合し、水に分散させて０．３質量％のスラリーを作製し、紙料とした。この紙料を各形シートマシンにてシート化し、製紙用フェルトにこのシートを転移させ、麻繊維シートを形成した。このシートを１２０℃に加熱したシリンダードライヤーにて乾燥し、米坪１１０．１ｇ/ｍ2で厚さ５８７μｍのシートを得た。
【００２６】
実施例及び比較例で得られた抄き合わせシートについて、柔軟度及び線膨張係数を下記のようにして評価した。またシートの繊維の毛羽立ちを目視で確認した。
＜柔軟度＞：ＴＡＰＰＩ スタンダード Ｔ５４３ ｐｍ−８４に準じた。
＜線膨張係数＞：
測定機器：熊谷理機工業株式会社製 自動式紙伸縮計 Ｎｏ．２０７８−III
試験条件：試験片を測定器にセットした後、２０℃、３０％ＲＨの環境下で３時間保ち、基準長を定めた。その後、１℃/分の割合で昇温させ８０℃、３０％ＲＨとした。この環境下で３時間保った後、試験片の伸縮長を測定し、測定値とした。
伸縮率（％）＝（測定値/基準長）×１００
【００２７】
結果は表１に示した通りである。
【表１】
BACKGROUND OF THE INVENTION
The present invention relates to a sheet formed by combining two or more fiber sheets, in particular, a sheet comprising at least a certain amount of hemp fibers and a sheet made of thermoplastic fibers, and is friendly to the environment and human body, and has a rigidity. The present invention relates to a hemp mixed sheet suitable for a high sheet, for example, an automobile interior material.
[0002]
[Prior art]
As one use of a thermoplastic resin, a use as an interior material of an automobile has been conventionally known. In this case, (1) high rigidity, (2) light weight, and (3) low coefficient of linear expansion are required. The reduction of the linear expansion coefficient is caused by the fact that the temperature inside the automobile fluctuates greatly depending on the season, and the temperature difference reaches as high as 100 ° C. However, the demand cannot be satisfied with only the thermoplastic resin.
Therefore, various techniques for reducing the coefficient of linear expansion of thermoplastic resin interior materials have been proposed, and a representative technique is that a glass fiber mat is used as a surface of a thermoplastic resin layer. It is known that it is affixed to a laminate.
[0003]
However, in recent years, it has been found that glass fiber becomes a causative substance similar to asbestos in pneumoconiosis, and it is becoming a target of regulation from the viewpoint of the manufacturing work environment and the difficulty of disposal, so the development of an alternative is desired. It came to. On the other hand, a laminate comprising a hemp fiber-containing thermoplastic resin sheet layer composed of a thermoplastic resin and 50 to 90% by weight of hemp fibers and one or more layers each composed of a thermoplastic resin. Proposed (Patent Documents 1 and 2).
[0004]
[Patent Document 1]
JP 2001-121651A [Patent Document 2]
Japanese Patent Laid-Open No. 2001-122046
[Problems to be solved by the invention]
However, since the above laminated sheet is obtained by pasting together a hemp fiber-containing thermoplastic resin sheet and a sheet made of a thermoplastic resin separately prepared in advance, the manufacturing process is complicated and expensive. Moreover, since the thing bonded together with the adhesive agent uses a solvent, there existed a fault that a working environment deteriorated at the time of manufacture. Further, when hemp fibers having high rigidity are included in the sheet, when the sheet is bent, a part of the hemp fibers jumps out of the sheet to cause fluffing or sometimes falls off.
Therefore, as a result of intensive studies to solve the above-mentioned drawbacks, the present inventor has made all the thermoplastic resin into fibers, and when a laminated sheet is produced together with hemp fibers by using the assembling technique, it is only cheap. Therefore, the present inventors have found that it is possible to obtain a sheet that is kind to the environment and the human body and has high rigidity, for example, a sheet suitable as an automobile interior material.
Accordingly, a first object of the present invention is to provide a hemp mixed sheet that is inexpensive, friendly to the environment and the human body, has high rigidity , and prevents hemp fibers from falling off .
[0006]
[Means for solving the problems]
The above objects of the present invention are to provide resin fibers containing 80% by mass or more of thermoplastic resin fibers on both sides of a hemp fiber sheet containing 30 to 90% by mass of hemp fibers and 10 to 70% by mass of thermoplastic resin fibers. the sheet was accomplished by hemp混抄sheet characterized by comprising the combined paper making by at least one layer.
The thermoplastic resin fiber contained in the hemp fiber sheet is preferably a thermomeltable resin fiber having a melting point of 80 to 180 ° C, and the thermoplastic resin fiber contained in the resin fiber sheet has a melting point of 80 to 180 ° C. It is preferable that it consists of 30-60 mass% of thermomeltable resin fibers and 40-70 mass% of thermoplastic resin fibers having a melting point of 200 ° C. or higher. Further, hemp fibers used in the present invention, it is not preferable Young's modulus is of 2,500kg / mm 2 or more.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The hemp fibers used in the present invention can be appropriately selected from known hemp fibers such as linen (flax), ramie (hema), jute (yellow hemp), manila hemp, sisal hemp, and kenaf (marine). The Young's modulus is preferably 2,500 kg / mm 2 or more. By using a material having such a high Young's modulus, it is possible to obtain a hemp mixed paper sheet having high rigidity and suitable as an automobile interior material, for example.
Since the hemp mixed paper sheet of the present invention is manufactured by papermaking, the fiber length of hemp fibers and the like is 3 to 100 mm, and particularly preferably 10 to 60 mm. The fiber diameter is 10 to 500 μm, preferably 100 to 300 μm.
[0008]
In the present invention, the other fibers contained in the sheet containing 30 to 90% by weight of hemp fibers are mainly thermoplastic resin fibers, but this hinders the heat-sealing of each layer by heating after assembling. As long as it does not occur, other fibers may be used in combination as appropriate. The content of the thermoplastic resin fiber is preferably 70 to 10% by mass. The thermoplastic resin fiber used here is preferably a so-called heat-meltable resin fiber having a melting point of 80 to 180 ° C, particularly preferably 100 to 160 ° C. Examples of such thermoplastic resin fibers include polyethylene resin fibers, polypropylene resin fibers, and polyester resin fibers.
[0009]
The resin fiber sheet containing thermoplastic resin fibers in the present invention is a sheet having 80% by mass or more of thermoplastic resin fibers. The thermoplastic resin fiber in this case is a combination of a thermomeltable resin fiber having a melting point of 80 to 180 ° C. and a thermoplastic resin fiber having a melting point of 200 ° C. or higher used in the sheet containing the hemp fiber. Is preferred. By using these thermoplastic resin fibers in combination, the heat-melting resin fibers having a melting point of 80 to 180 ° C. are melted by heating during the paper making process, and the melting points in the resin fiber sheet are 200 ° C. or more. Adhering each other or the resin fiber sheet and the hemp fiber sheet and covering the surface of the hemp fiber sheet with the resin fiber sheet can prevent the hemp fibers in the hemp fiber sheet from fluffing or falling off more reliably. Can do. The content of the heat-meltable resin fiber having a melting point of 80 to 180 ° C is preferably 30 to 60% by mass, and the content of the thermoplastic resin fiber having a melting point of 200 ° C or higher is preferably 40 to 70% by mass. Further, fibers other than the thermoplastic resin fibers used in this sheet can be appropriately selected from known fibers and used.
The resin fiber sheet in the present invention can prevent fluffing or falling off of the hemp fibers contained in the hemp mixed paper sheet by making paper with the hemp fiber sheet.
The resin fiber sheets it is necessary to align the paper making both surfaces of hemp fiber sheet.
[0010]
The hemp mixed paper sheet of the present invention can be produced by a known multilayer paper machine. For example, a multi-layer paper machine having two circular nets and one short net is mentioned.
When this paper machine is used, thermoplastic resin fibers are dispersed in water to produce a slurry, which is used as a paper stock. This stock is made with a circular net to form a resin fiber sheet. On the other hand, hemp fibers and thermoplastic resin fibers are dispersed in water to produce a slurry, which is used as a paper stock. This stock is made with a short mesh to form a hemp fiber sheet. At the same time, the hemp mixed sheet of the present invention can be obtained by successively laminating a resin fiber sheet, a hemp fiber sheet, and a resin fiber sheet in this order on a blanket and drying.
[0011]
【The invention's effect】
In the present invention, since a laminated sheet is produced continuously by sheeting, the production efficiency is good, thereby reducing the production cost of the sheet, and without using an adhesive harmful to the environment and the human body. May be. Moreover, the fluffing and dropping of hemp fibers are prevented.
[0012]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention further in full detail, this invention is not limited by this.
[0013]
Example 1.
As thermoplastic resin fibers, 50 parts by mass of polyester fiber (Kuraray ester EP-133: melting point 263 ° C.) and 50 parts by mass of heat-meltable polyester fiber (Kuraray Sofit N-720: melting point 110 ° C.) are mixed and dispersed in water. A slurry of 3% by mass was prepared and used as a paper stock. This stock was formed into a sheet by a square sheet machine, and the sheet was transferred to a papermaking felt to form a first resin fiber sheet (a rice basis weight after drying was about 10 g / m 2 ).
[0014]
60 parts by mass of sisal hemp (fiber length 20 mm, fiber diameter 182 μm, Young's modulus: 5500 kg / mm 2 ) and 40 parts by mass of hot-melt polyester fiber (Unitika Melty 4000: melting point 110 ° C.) are mixed and dispersed in water to obtain 0 A slurry of 3% by mass was prepared and used as a paper stock. This stock is formed into a sheet by a square sheet machine to form a hemp fiber sheet (the basis weight of rice after drying is about 100 g / m 2 ), and the first resin fiber sheet previously transferred to a papermaking felt is formed on the first resin fiber sheet. The sheet was transferred to obtain a laminated sheet consisting of two layers.
[0015]
As thermoplastic resin fibers, 50 parts by mass of polyester fiber (Kuraray ester EP-133: melting point 263 ° C.) and 50 parts by mass of hot-melt polyester fiber (Kuraray Sofit N-720: melting point 110 ° C.) are mixed and dispersed in water. A 0.3% slurry was prepared and used as a paper stock. The paper sheet is formed into a sheet by a square sheet machine to form a second resin fiber sheet (rice basis weight after drying is about 10 g / m 2 ), and the sheet is then transferred to a papermaking felt. The sheet was transferred onto a hemp fiber sheet to obtain a sheet made of three layers.
The laminated sheet composed of these three layers was dried with a cylinder dryer heated to 120 ° C. to obtain a sheet having a basis weight of 129.2 g / m 2 and a thickness of 565 μm.
[0016]
Example 2
As thermoplastic resin fibers, 50 parts by mass of polyester fiber (Kuraray ester EP-133: melting point 263 ° C.) and 50 parts by mass of hot-melt polyester fiber (Kuraray Sofit N-720: melting point 110 ° C.) are mixed and dispersed in water. A slurry of 0.3% by mass was prepared and used as a paper stock. This stock was formed into a sheet by a square sheet machine, and the sheet was transferred to a papermaking felt to form a first resin fiber sheet (a rice basis weight after drying was about 10 g / m 2 ).
[0017]
60 parts by weight of flax (fiber length 20 mm, fiber diameter 30 μm, Young's modulus: 2500 kg / mm 2 ) and 40 parts by weight of hot-melt polyester fiber (Unitika Melty 4000: melting point 110 ° C.) are mixed and dispersed in water to give a mixture of 0. A 3% by mass slurry was prepared and used as a paper stock. This stock is formed into a sheet by a square sheet machine to form a hemp fiber sheet (the basis weight of rice after drying is about 100 g / m 2 ), and the first resin fiber sheet previously transferred to a papermaking felt is formed on the first resin fiber sheet. The sheet was transferred to obtain a laminated sheet consisting of two layers.
[0018]
As thermoplastic resin fibers, 50 parts by mass of polyester fiber (Kuraray ester EP-133: melting point 263 ° C.) and 50 parts by mass of hot-melt polyester fiber (Kuraray Sofit N-720: melting point 110 ° C.) are mixed and dispersed in water. A slurry of 0.3% by mass was prepared and used as a paper stock. The paper sheet is formed into a sheet by a square sheet machine to form a second resin fiber sheet (rice basis weight after drying is about 10 g / m 2 ), and the sheet is then transferred to a papermaking felt. The sheet was transferred onto a hemp fiber sheet to obtain a sheet made of three layers.
The laminated sheet composed of these three layers was dried with a cylinder dryer heated to 120 ° C. to obtain a sheet having a mass of 127.4 g / m 2 and a thickness of 434 μm.
[0019]
Comparative Example 1
As thermoplastic resin fibers, 50 parts by mass of polyester fiber (Kuraray ester EP-133: melting point 263 ° C.) and 50 parts by mass of hot-melt polyester fiber (Kuraray Sofit N-720: melting point 110 ° C.) are mixed and dispersed in water. A slurry of 0.3% by mass was prepared and used as a paper stock. This stock was formed into a sheet by a square sheet machine, and the sheet was transferred to a papermaking felt to form a first resin fiber sheet (a rice basis weight after drying was about 10 g / m 2 ).
[0020]
30 parts by weight of cotton (fiber length 20 mm, fiber diameter 10 μm, Young's modulus: 1,200 kg / mm 2 ) and 70 parts by weight of hot-melting polyester fiber (Unitika Melty 4000: melting point 110 ° C.) are mixed and dispersed in water. A slurry of 0.3% by mass was prepared and used as a paper stock. This stock is formed into a sheet by a square sheet machine to form a fiber sheet (rice basis weight after drying is about 100 g / m 2 ), and is transferred onto the first resin fiber sheet previously transferred to a papermaking felt. Thus, a sheet-making sheet comprising two layers was obtained.
[0021]
As thermoplastic resin fibers, 50 parts by mass of polyester fiber (Kuraray ester EP-133: melting point 263 ° C.) and 50 parts by mass of hot-melt polyester fiber (Kuraray Sofit N-720: melting point 110 ° C.) are mixed and dispersed in water. A slurry of 0.3% by mass was prepared and used as a paper stock. The paper sheet is formed into a sheet by a square sheet machine to form a second resin fiber sheet (rice basis weight after drying is about 10 g / m 2 ), and the sheet is then transferred to a papermaking felt. This was transferred onto a fiber sheet to obtain a sheet made of three layers.
The laminated sheet composed of these three layers was dried with a cylinder dryer heated to 120 ° C. to obtain a sheet of 317 μm in thickness of 124.4 g / m 2 .
[0022]
Comparative Example 2
As thermoplastic resin fibers, 50 parts by mass of polyester fiber (Kuraray ester EP-133: melting point 263 ° C.) and 50 parts by mass of hot-melt polyester fiber (Kuraray Sofit N-720: melting point 110 ° C.) are mixed and dispersed in water. A slurry of 0.3% by mass was prepared and used as a paper stock. This stock was formed into a sheet by a square sheet machine, and this sheet was transferred to a papermaking felt to form a first resin fiber sheet (a rice basis weight after drying was about 10 g / m 2 ).
[0023]
20 parts by weight of flax (fiber length 20 mm, fiber diameter 30 μm, Young's modulus: 2,500 kg / mm 2 ) and 80 parts by weight of hot melt polyester fiber (Unitika Melty 4000: melting point 110 ° C.) are mixed and dispersed in water. A slurry of 0.3% by mass was prepared and used as a paper stock. This stock is formed into a sheet by a square sheet machine to form a hemp fiber sheet (the basis weight of rice after drying is about 100 g / m 2 ), and the first resin fiber sheet previously transferred to a papermaking felt is formed on the first resin fiber sheet. The sheet was transferred to obtain a laminated sheet consisting of two layers.
[0024]
As thermoplastic resin fibers, 50 parts by mass of polyester fiber (Kuraray ester EP-133: melting point 263 ° C.) and 50 parts by mass of hot-melt polyester fiber (Kuraray Sofit N-720: melting point 110 ° C.) are mixed and dispersed in water. A slurry of 0.3% by mass was prepared and used as a paper stock. This paper stock is formed into a sheet by a square sheet machine to form a third layer (rice basis weight after drying is about 10 g / m 2 ), and the hemp fibers of the above-mentioned sheet-sheet made by transferring to a papermaking felt first. It transferred on the sheet | seat and the sheet-bonding sheet | seat which consists of three layers was obtained.
The laminated sheet consisting of these three layers was dried with a cylinder dryer heated to 120 ° C. to obtain a sheet of 125.8 g / m 2 and a thickness of 280 μm.
[0025]
Comparative Example 3
60 parts by mass of sisal hemp (fiber length 20 mm, fiber diameter 182 μm, Young's modulus 5,500 kg / mm 2 ) and 40 parts by mass of hot-melt polyester fiber (Kuraray Unitika Melty 4000: melting point 110 ° C.) are mixed and dispersed in water. A 0.3% by mass slurry was prepared and used as a paper stock. This stock was made into a sheet by each form sheet machine, and this sheet was transferred to a papermaking felt to form a hemp fiber sheet. This sheet was dried with a cylinder dryer heated to 120 ° C. to obtain a sheet having a mass of 58.7 μm at a mass of 110.1 g / m 2 .
[0026]
About the laminated sheet obtained by the Example and the comparative example, the softness | flexibility and the linear expansion coefficient were evaluated as follows. The fiber fluff of the sheet was confirmed visually.
<Flexibility>: Conforms to TAPPI standard T543 pm-84.
<Linear expansion coefficient>:
Measuring instrument: Automatic paper extensometer No. 2078-III
Test conditions: After the test piece was set in a measuring instrument, it was kept in an environment of 20 ° C. and 30% RH for 3 hours to determine a reference length. Thereafter, the temperature was raised at a rate of 1 ° C./min to 80 ° C. and 30% RH. After maintaining for 3 hours in this environment, the stretch length of the test piece was measured and used as a measured value.
Expansion rate (%) = (measured value / reference length) x 100
[0027]
The results are as shown in Table 1.
[Table 1]
Claims (4)
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